When is it necessary for workers to conduct a respirator fit test?

Conducting a respirator fit test is crucial whenever workers are exposed to respiratory hazards, particularly when different types of respirators are being used. A fit test ensures that the respirator forms a proper seal on the wearer's face. This seal is integral to ensuring the effectiveness of the respirator in preventing harmful contaminants from entering.

Whenever a new type of respirator is introduced, it is essential to conduct a fit test to verify that the respirator fits correctly and provides the necessary protection for the user. This testing takes into account the specific design and characteristics of the respirator and the individual facial features of the worker, which can vary significantly from person to person.

The other scenarios, such as conducting a fit test after exposure or only when new models are purchased, do not capture the essential requirement that fit tests must be performed anytime a different type of respirator is utilized. Additionally, performing a fit test after every cleaning does not align with safety protocols, as fit tests are not typically required after routine maintenance but rather upon changing respirator types. Thus, conducting fit tests with each new type of respirator ensures ongoing safety and compliance with health regulations.